Jeffrey Joseph McGuire
Jeff McGuire is a research geophysicist in the Earthquake Hazards Program.
Science and Products
Filter Total Items: 24
A long-term geothermal observatory across subseafloor gas hydrates, IODP Hole U1364A, Cascadia accretionary prism
We report 4 years of temperature profiles collected from May 2014 to May 2018 in Integrated Ocean Drilling Program Hole U1364A in the frontal accretionary prism of the Cascadia subduction zone. The temperature data extend to depths of nearly 300 m below seafloor (mbsf), spanning the gas hydrate stability zone at the location and a clear bottom-simulating reflector (BSR) at ∼230 mbsf. When the hole
Authors
K. Elizabeth Becker, E. E. Davis, M. Hessemann, J. A. Collins, Jeffrey McGuire
ShakeAlert Earthquake Early Warning System Performance During the 2019 Ridgecrest Earthquake Sequence
During July 2019, a sequence of earthquakes including a Mw6.4 foreshock and a Mw7.1 mainshock occurred near Ridgecrest, California. ShakeAlert, the U.S. Geological Survey (USGS) ShakeAlert public Earthquake Early Warning (EEW) system being developed for the U.S. West Coast, was operational during this time, though public alerting was only available within LA County. ShakeAlert created alert messag
Authors
Angela Chung, Men-Andrin Meier, Jennifer Andrews, Maren Böse, Brendan Crowell, Jeffrey McGuire, Deborah Smith
New opportunities to study earthquake precursors
No abstract available.
Authors
M. E. Pritchard, R. M. Allen, T. W. Becker, M. D. Behn, E. E. Brodsky, R. Burgmann, C. Ebinger, J. T. Freymueller, M. C. Gerstenberger, B. Haines, Y. Kaneko, S. D. Jacobsen, N. Lindsey, Jeffrey McGuire, Morgan T. Page, S. Ruiz, M. Tolstoy, L. Wallace, W. R. Walter, W. Wilcock, H. Vincent
Abundant spontaneous and dynamically triggered submarine landslides in the Gulf of Mexico
Submarine landslides that occur offshore are common along the U.S. continental margins. These mass wasting events can trigger tsunamis and hence potentially devastate coastal communities and damage offshore infrastructure. However, the initiation and failure processes of submarine landslides are poorly understood. Here, we identify and locate 85 previously unknown submarine landslides in the Gulf
Authors
Wenyuan Fan, Jeffrey McGuire, Peter M. Shearer
Aseismic transient slip on the Gofar transform fault, East Pacific Rise
Oceanic transform faults display a unique combination of seismic and aseismic slip behavior, including a large globally averaged seismic deficit, and the local occurrence of repeating magnitude (M) ∼6∼6 earthquakes with abundant foreshocks and seismic swarms, as on the Gofar transform of the East Pacific Rise and the Blanco Ridge in the northeast Pacific Ocean. However, the underlying mechanisms t
Authors
Yajing Liu, Jeffrey McGuire, Mark Behn
Semiautomated estimates of directivity and related source properties of small to moderate southern California earthquakes using second seismic moments
We develop a semiautomated method for estimating with second seismic moments the directivity, rupture area, duration, and centroid velocity of earthquakes. The method is applied to 41 southern California earthquakes with magnitude in the range 3.5–5.2 and provides stable results for 28 events. Apparent source time functions (ASTFs) of P and S phases are derived using deconvolution with three stack
Authors
Haoran Meng, Jeffrey McGuire, Yehuda Ben-Zion
Stormquakes
Seismic signals from ocean-solid Earth interactions are ubiquitously recorded on our planet. However, these wavefields are typically incoherent in most frequency bands limiting their utilization for understanding ocean dynamics or solid Earth properties. In contrast, we find that during large storms such as hurricanes and Nor’easters the interaction of long-period ocean waves with shallow seafloor
Authors
Wenyuan Fan, Jeffrey McGuire, C. D. de Groot-Hedlin, M. A. H. Hedlin, S. Coats, J. W. Fiedler
Stress rotation across the Cascadia megathrust requires a weak subduction plate boundary at seismogenic depths
The Mendocino Triple Junction region is the most seismically active part of the Cascadia Subduction Zone. The northward moving Pacific plate collides with the subducting Gorda plate causing intense internal deformation within it. Here we show that the stress field rotates rapidly with depth across the thrust interface from a strike-slip regime within the subducting plate, reflecting the Pacific pl
Authors
Duo Li, Jeffrey J. McGuire, Yajing Liu, Jeanne L. Hardebeck
Genetic assessment of the effects of streamscape succession on coho salmon Oncorhynchus kisutch colonization in recently deglaciated streams
Measures of genetic diversity within and among populations and historical geomorphological data on stream landscapes were used in model simulations based on approximate Bayesian computation (ABC) to examine hypotheses of the relative importance of stream features (geomorphology and age) associated with colonization events and gene flow for coho salmon Oncorhynchus kisutch breeding in recently degl
Authors
Kim T. Scribner, Chad Soiseth, Jeffrey J. McGuire, G. Kevin Sage, Lyman K. Thorsteinson, J. L. Nielsen, E. Knudsen
Observations of seismicity and ground motion in the northeast U.S. Atlantic margin from ocean bottom seismometer data
Earthquake data from two short-period ocean-bottom seismometer (OBS) networks deployed for over a year on the continental slope off New York and southern New England were used to evaluate seismicity and ground motions along the continental margin. Our OBS networks located only one earthquake of Mc∼1.5 near the shelf edge during six months of recording, suggesting that seismic activity (MLg>3.0) of
Authors
Claudia Flores, Uri S. ten Brink, Jeffrey J. McGuire, John A. Collins
Relationships among seismic velocity, metamorphism, and seismic and aseismic fault slip in the Salton Sea Geothermal Field region
The Salton Sea Geothermal Field is one of the most geothermally and seismically active areas in California and presents an opportunity to study the effect of high-temperature metamorphism on the properties of seismogenic faults. The area includes numerous active tectonic faults that have recently been imaged with active source seismic reflection and refraction. We utilize the active source surveys
Authors
Jeffrey J. McGuire, Rowena B. Lohman, Rufus D. Catchings, Michael J. Rymer, Mark R. Goldman
Detecting aseismic strain transients from seismicity data
Aseismic deformation transients such as fluid flow, magma migration, and slow slip can trigger changes in seismicity rate. We present a method that can detect these seismicity rate variations and utilize these anomalies to constrain the underlying variations in stressing rate. Because ordinary aftershock sequences often obscure changes in the background seismicity caused by aseismic processes, we
Authors
Andrea L. Llenos, Jeffrey McGuire
Science and Products
Filter Total Items: 24
A long-term geothermal observatory across subseafloor gas hydrates, IODP Hole U1364A, Cascadia accretionary prism
We report 4 years of temperature profiles collected from May 2014 to May 2018 in Integrated Ocean Drilling Program Hole U1364A in the frontal accretionary prism of the Cascadia subduction zone. The temperature data extend to depths of nearly 300 m below seafloor (mbsf), spanning the gas hydrate stability zone at the location and a clear bottom-simulating reflector (BSR) at ∼230 mbsf. When the hole
Authors
K. Elizabeth Becker, E. E. Davis, M. Hessemann, J. A. Collins, Jeffrey McGuire
ShakeAlert Earthquake Early Warning System Performance During the 2019 Ridgecrest Earthquake Sequence
During July 2019, a sequence of earthquakes including a Mw6.4 foreshock and a Mw7.1 mainshock occurred near Ridgecrest, California. ShakeAlert, the U.S. Geological Survey (USGS) ShakeAlert public Earthquake Early Warning (EEW) system being developed for the U.S. West Coast, was operational during this time, though public alerting was only available within LA County. ShakeAlert created alert messag
Authors
Angela Chung, Men-Andrin Meier, Jennifer Andrews, Maren Böse, Brendan Crowell, Jeffrey McGuire, Deborah Smith
New opportunities to study earthquake precursors
No abstract available.
Authors
M. E. Pritchard, R. M. Allen, T. W. Becker, M. D. Behn, E. E. Brodsky, R. Burgmann, C. Ebinger, J. T. Freymueller, M. C. Gerstenberger, B. Haines, Y. Kaneko, S. D. Jacobsen, N. Lindsey, Jeffrey McGuire, Morgan T. Page, S. Ruiz, M. Tolstoy, L. Wallace, W. R. Walter, W. Wilcock, H. Vincent
Abundant spontaneous and dynamically triggered submarine landslides in the Gulf of Mexico
Submarine landslides that occur offshore are common along the U.S. continental margins. These mass wasting events can trigger tsunamis and hence potentially devastate coastal communities and damage offshore infrastructure. However, the initiation and failure processes of submarine landslides are poorly understood. Here, we identify and locate 85 previously unknown submarine landslides in the Gulf
Authors
Wenyuan Fan, Jeffrey McGuire, Peter M. Shearer
Aseismic transient slip on the Gofar transform fault, East Pacific Rise
Oceanic transform faults display a unique combination of seismic and aseismic slip behavior, including a large globally averaged seismic deficit, and the local occurrence of repeating magnitude (M) ∼6∼6 earthquakes with abundant foreshocks and seismic swarms, as on the Gofar transform of the East Pacific Rise and the Blanco Ridge in the northeast Pacific Ocean. However, the underlying mechanisms t
Authors
Yajing Liu, Jeffrey McGuire, Mark Behn
Semiautomated estimates of directivity and related source properties of small to moderate southern California earthquakes using second seismic moments
We develop a semiautomated method for estimating with second seismic moments the directivity, rupture area, duration, and centroid velocity of earthquakes. The method is applied to 41 southern California earthquakes with magnitude in the range 3.5–5.2 and provides stable results for 28 events. Apparent source time functions (ASTFs) of P and S phases are derived using deconvolution with three stack
Authors
Haoran Meng, Jeffrey McGuire, Yehuda Ben-Zion
Stormquakes
Seismic signals from ocean-solid Earth interactions are ubiquitously recorded on our planet. However, these wavefields are typically incoherent in most frequency bands limiting their utilization for understanding ocean dynamics or solid Earth properties. In contrast, we find that during large storms such as hurricanes and Nor’easters the interaction of long-period ocean waves with shallow seafloor
Authors
Wenyuan Fan, Jeffrey McGuire, C. D. de Groot-Hedlin, M. A. H. Hedlin, S. Coats, J. W. Fiedler
Stress rotation across the Cascadia megathrust requires a weak subduction plate boundary at seismogenic depths
The Mendocino Triple Junction region is the most seismically active part of the Cascadia Subduction Zone. The northward moving Pacific plate collides with the subducting Gorda plate causing intense internal deformation within it. Here we show that the stress field rotates rapidly with depth across the thrust interface from a strike-slip regime within the subducting plate, reflecting the Pacific pl
Authors
Duo Li, Jeffrey J. McGuire, Yajing Liu, Jeanne L. Hardebeck
Genetic assessment of the effects of streamscape succession on coho salmon Oncorhynchus kisutch colonization in recently deglaciated streams
Measures of genetic diversity within and among populations and historical geomorphological data on stream landscapes were used in model simulations based on approximate Bayesian computation (ABC) to examine hypotheses of the relative importance of stream features (geomorphology and age) associated with colonization events and gene flow for coho salmon Oncorhynchus kisutch breeding in recently degl
Authors
Kim T. Scribner, Chad Soiseth, Jeffrey J. McGuire, G. Kevin Sage, Lyman K. Thorsteinson, J. L. Nielsen, E. Knudsen
Observations of seismicity and ground motion in the northeast U.S. Atlantic margin from ocean bottom seismometer data
Earthquake data from two short-period ocean-bottom seismometer (OBS) networks deployed for over a year on the continental slope off New York and southern New England were used to evaluate seismicity and ground motions along the continental margin. Our OBS networks located only one earthquake of Mc∼1.5 near the shelf edge during six months of recording, suggesting that seismic activity (MLg>3.0) of
Authors
Claudia Flores, Uri S. ten Brink, Jeffrey J. McGuire, John A. Collins
Relationships among seismic velocity, metamorphism, and seismic and aseismic fault slip in the Salton Sea Geothermal Field region
The Salton Sea Geothermal Field is one of the most geothermally and seismically active areas in California and presents an opportunity to study the effect of high-temperature metamorphism on the properties of seismogenic faults. The area includes numerous active tectonic faults that have recently been imaged with active source seismic reflection and refraction. We utilize the active source surveys
Authors
Jeffrey J. McGuire, Rowena B. Lohman, Rufus D. Catchings, Michael J. Rymer, Mark R. Goldman
Detecting aseismic strain transients from seismicity data
Aseismic deformation transients such as fluid flow, magma migration, and slow slip can trigger changes in seismicity rate. We present a method that can detect these seismicity rate variations and utilize these anomalies to constrain the underlying variations in stressing rate. Because ordinary aftershock sequences often obscure changes in the background seismicity caused by aseismic processes, we
Authors
Andrea L. Llenos, Jeffrey McGuire